冷凝器按排气凝结方式不同，分为混合式冷凝器和表面式冷凝器。
参考答案：对
国有资金投资的工程建设项目实行工程量清单招标，必须编制（）。
A．招标控制价
B．工程量清单说明
C．最低交易价
D．招标文件说明
根据首字母提示完成单词 。
1. Dave has worked for 6 hours, so now he is very s .
2. The o day, he bought a present for me.
3. They aren't s enough at that age.
4. He often s___ up reading until midnight.
5. Do you like your school u____?
